Wow, quite a back and forth. I was also puzzled by this.

First of all, if 70% of Fortune 100 has large scale deployments, Cisco's market share would be higher than a supposedly market-leading, but still paltry, 16.4%. Where did the days when Cisco owned 65%+ of a market or didn't bother?

Second of all, I find it kind of questionable to sneak in the home-grown claim of "70% of Fortune 100" into a blog that cites the Gartner market share report, thanks making it look like that prior 70% is validated by Gartner by association. Not sure this falls within Gartner's usage rules, but that's for them to establish.

I have no doubt that Cisco is among the top 3 Sd-WAN vendors, because that's been validated by pretty much every market study and it makes sense. By Cisco standards, 16.4% is probably not very high. And the 70% of Fotune 100 claim is utterly and totally unsupported.